Travelers to the pacific coast in the mid-1800s faced a challenge that other pioneers did not face. this challenge was

(C)

Explanation: High mountains. The West Coast or Pacific Coast is the coastline along which the continental Western United States meets the North Pacific Ocean.

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the industrial revolution pushed the world into modern industrialization. it changed the course of history profoundly. it caused rapid urbanization and pushed cities and countries into development. the industrial revolution began in great britain with a series with new inventions which led to the creation of machines and mass production.

this caused the country to gain wealth and money and become an international superpower. it improved transportation and manufacturing inside the country, pushed people to live in urban areas and britain to become the most powerful nation in the world for a while.